| Value | Category | Cases | |
|---|---|---|---|
| 1 | NO DIFFICULTY | 7413 |
94.7%
|
| 2 | SOME DIFFICULTY | 335 |
4.3%
|
| 3 | A LOT OF DIFFICULTY | 24 |
0.3%
|
| 4 | CANNOT CONCENTRATE AT ALL | 17 |
0.2%
|
| 9 | NO RESPONSE | 1 |
0%
|
| Sysmiss | 34 |
0.4%
|